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学者姓名：李炎锋
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Abstract ：
The critical velocity, confinement velocity and smoke back-layering length are significant factors for smoke control in a tunnel fire. This research aims to analysis the correlation of these 3 key smoke control parameters in the different door opening scenarios during a fire in the metro train carriage that stopped in the tunnel. Scaled model experiment measurement and numerical simulations were carried out for the propagation and control of smoke. Five fire locations in the train and two side doors opening scenarios of the train were considered. Results show that smoke back-layering length in the train can be barely influenced by the activation time of the lon-gitudinal ventilation system. However, the opening of side doors could result in a shorter smoke back-layering length in the train. Furthermore, we present a dimensionless correlation for the critical velocity and confine-ment velocity of underground train fires caused by fires in the double-length narrow space of an underground tunnel. This study provides a predictive model for the design of smoke control systems for fire of train stopped in underground tunnels.
Keyword ：
Confinement velocity Confinement velocity Door opening scenarios Door opening scenarios Underground tunnel Underground tunnel Fire Fire Critical velocity Critical velocity
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| GB/T 7714 | Su, Zhihe , Li, Yanfeng , Feng, Shan et al. A study of the critical velocity and the confinement velocity of fire accident in a longitudinally ventilated underground train with different door opening scenarios [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2023 , 131 . |
| MLA | Su, Zhihe et al. "A study of the critical velocity and the confinement velocity of fire accident in a longitudinally ventilated underground train with different door opening scenarios" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 131 (2023) . |
| APA | Su, Zhihe , Li, Yanfeng , Feng, Shan , Zhong, Hua , Li, Junmei , Liu, Wenbo et al. A study of the critical velocity and the confinement velocity of fire accident in a longitudinally ventilated underground train with different door opening scenarios . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2023 , 131 . |
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Abstract ：
This research aims to establish a series of small-scale experiments to analyze the effect of ramp slopes on the temperature distribution of Liquefied Petroleum Gas (LPG) fire in a model branched tunnel under longitudinal ventilation. The heat release rate under experimental conditions reached 2.57 kW to 7.70 kW and five ramp slopes of 0 %, 3 %, 5 %, 7 % and 9 % were conducted. For a specific given bifurcation angle, the maximum exceedance temperature of the fire in the expanding region before the bifurcation angle is measured and ana- lysed. Results show that the maximum exceedance temperature in the main tunnel increases as the ramp slope decreases, which is mainly because the stack effect enhances the entrainment of the air and accelerates the smoke flow. Furthermore, the modified model of the maximum exceedance temperature, which could consider the influence of ramp slope for a branch tunnel fire is established according to the experimental results. The pre- dicted results agree well with those of the experimental study for the main tunnel. The results could provide a reference and contribute to the knowledge of smoke extraction strategies designed for branched tunnels.
Keyword ：
Ramp slopes Ramp slopes Longitudinal ventilation Longitudinal ventilation Maximum exceedance temperature Maximum exceedance temperature Branched tunnels Branched tunnels
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| GB/T 7714 | Li, Jiaxin , Li, Yanfeng , Li, Junmei et al. Experimental analysis of the effect of the ramp slopes on the maximum exceedance temperature in a branched tunnel fire [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2023 , 131 . |
| MLA | Li, Jiaxin et al. "Experimental analysis of the effect of the ramp slopes on the maximum exceedance temperature in a branched tunnel fire" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 131 (2023) . |
| APA | Li, Jiaxin , Li, Yanfeng , Li, Junmei , Zhong, Hua , Zhao, Jianlong , Xu, Desheng . Experimental analysis of the effect of the ramp slopes on the maximum exceedance temperature in a branched tunnel fire . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2023 , 131 . |
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Abstract ：
The smoke back-layering length is a crucial parameter for evacuating people in both road and subway tunnel fires. This study investigates the fire hazard induced by carriage fire in inclined metro tunnels under natural ventilation. The parameter 'transition slope' is defined to measure the smoke flow from the carriage head in the upstream direction to the tunnel or not due to the stack effect of the tunnel slope. The aim of this paper is to analyse the effects of changes in cross-section, downstream length, tunnel slope, and carriage side-door coupling on smoke behaviour characteristics by experiment and simulation methods. A piecewise function expression between dimensionless smoke back-layering length, downstream length, and tunnel slope for carriage fires in an inclined tunnel under natural ventilation is proposed by theoretical analysis. At the same time, a 1:15 scale model experiment was conducted to initially analyse the characteristics of smoke movement. Following this, full-scale numerical simulations were employed to complement the model experiment and quantify the principles governing smoke movement. The experimental results show that the tunnel slope has a significant effect on the smoke back-layering length. In contrast, the influence of the heat release rate was found to be relatively minor. In addition, simulation results show that the tunnel slope has no significant effect on the smoke back-layering length when the fire location is approximately 20 m from the train head, and the tunnel slope is in the range of 2.29 degrees similar to 3.43 degrees (4% similar to 6%). For small tunnel slopes, smoke spreads in the tunnel, and the smoke back-layering length produced by the virtual fire source shows a different law from the previous study model. Finally, the correlation coefficient of the piecewise function in theoretical analysis is fitted by combining the experimental and numerical simulation results.Practical application This study provides valuable insights into the practical implications of controlling and mitigating the impact of fires in inclined metro tunnels. By understanding the critical role of tunnel slope and providing a quantitative tool for smoke spread law assessment, this study contributes to the enhancement of safety measures and the protection of lives in tunnel environments during fire incidents.
Keyword ：
Inclined metro tunnel Inclined metro tunnel smoke back-layering length smoke back-layering length natural ventilation natural ventilation fire source location fire source location tunnel fire tunnel fire transition slope transition slope
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| GB/T 7714 | Su, Zhihe , Li, Yanfeng , Zhong, Hua et al. Investigation of the fire hazard of underground space fire scenarios in urban metro tunnels under natural ventilation: Analysis of the impact of tunnel slope on smoke back-layering length [J]. | BUILDING SERVICES ENGINEERING RESEARCH & TECHNOLOGY , 2023 , 45 (2) : 161-184 . |
| MLA | Su, Zhihe et al. "Investigation of the fire hazard of underground space fire scenarios in urban metro tunnels under natural ventilation: Analysis of the impact of tunnel slope on smoke back-layering length" . | BUILDING SERVICES ENGINEERING RESEARCH & TECHNOLOGY 45 . 2 (2023) : 161-184 . |
| APA | Su, Zhihe , Li, Yanfeng , Zhong, Hua , Li, Junmei , Yang, Shi , Du, Tianmei et al. Investigation of the fire hazard of underground space fire scenarios in urban metro tunnels under natural ventilation: Analysis of the impact of tunnel slope on smoke back-layering length . | BUILDING SERVICES ENGINEERING RESEARCH & TECHNOLOGY , 2023 , 45 (2) , 161-184 . |
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Abstract ：
通过不同烟气环境中沿楼梯下行的移动实验，对不同年龄段以及不同烟气环境对人员下行的移动速度进行了研究。研究结果表明，轻烟环境和无烟环境中，人员的下行速度相差不大，但浓烟环境中，由于烟气造成的恐慌心理以及楼梯扶手的辅助作用，人员沿楼梯下行的速度要明显快于无烟和轻烟环境，这与平直走廊中烟气对人员移动速度的影响有明显的不同。相同疏散环境中，青少年的下行速度明显快于其他年龄段的同性别人群，男性速度分布区间集中在1.0～1.2 m/s,女性为0.8～0.95 m/s; 60岁以上的老人的下行速度稍慢，男性速度区间为0.82～0.92 m/s,女性为0.5～0.8 m/s;其他年龄段男性0.9～1.1 m/...
Keyword ：
实验 实验 疏散 疏散 楼梯下行 楼梯下行 烟气 烟气 下行速度 下行速度
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| GB/T 7714 | 李俊梅 , 王泽航 , 董启伟 et al. 烟气环境对人员沿楼梯下行速度影响的实验研究 [J]. | 建筑科学 , 2022 , 38 (02) : 181-186,194 . |
| MLA | 李俊梅 et al. "烟气环境对人员沿楼梯下行速度影响的实验研究" . | 建筑科学 38 . 02 (2022) : 181-186,194 . |
| APA | 李俊梅 , 王泽航 , 董启伟 , 乔雅心 , 李炎锋 , 涂登凯 . 烟气环境对人员沿楼梯下行速度影响的实验研究 . | 建筑科学 , 2022 , 38 (02) , 181-186,194 . |
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Abstract ：
This study simulated a series of bifurcation tunnel fire scenarios using the numerical code to investigate the temperature profile of bifurcation tunnel fire under natural ventilation. The bifurcation tunnel fire scenarios considered three bifurcation angles (30 degrees, 45 degrees, and 60 degrees) and six heat release rates (HRRs) (5, 10, 15, 20, 25, and 30 MW). According to the simulation results, the temperature profile with various HRRs and bifurcation angles was described. Furthermore, the effects of bifurcation angles and HRRs on the maximum temperature under the bifurcation tunnel ceiling and the temperature decay along the longitudinal direction of the branch were investigated. According to the theoretical analysis, two prediction models were proposed. These models can predict a bifurcation tunnel fire's maximum temperature and longitudinal temperature decay in the branch. The results of this study could be valuable for modelling a bifurcation tunnel fire and benefit the fire engineering design of bifurcation tunnels.
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| GB/T 7714 | Zhao, Jianlong , Li, Yanfeng , Li, Junmei et al. A study on the temperature profile of bifurcation tunnel fire under natural ventilation [J]. | PLOS ONE , 2022 , 17 (1) . |
| MLA | Zhao, Jianlong et al. "A study on the temperature profile of bifurcation tunnel fire under natural ventilation" . | PLOS ONE 17 . 1 (2022) . |
| APA | Zhao, Jianlong , Li, Yanfeng , Li, Junmei , Li, Jiaxin . A study on the temperature profile of bifurcation tunnel fire under natural ventilation . | PLOS ONE , 2022 , 17 (1) . |
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Abstract ：
针对国家高等教育发展对新工科的建设要求，分析了地方院校土木类专业建设新工科过程存在的主要问题，包括创新能力培养不足、跨学科知识教育重视程度不够、追踪行业新发展技术及培养学生国际化视野的力度不够。在分析问题产生原因的基础上，提出了土木类专业新工科建设思路和主要措施，即重构人才知识体系和专业课程体系，建立协同育人体系，加大国际化能力培养和建设适应新工科要求的师资队伍。研究结果对土木类专业开展新工科建设具有一定的参考价值。
Keyword ：
人才培养 人才培养 国际化 国际化 土木类专业 土木类专业 新工科 新工科
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| GB/T 7714 | 李炎锋 , 李俊梅 , 乔雅心 . 地方院校新工科建设思路的探索与研究——以土木类专业为例 [J]. | 教育教学论坛 , 2022 , PageCount-页数: 4 (08) : 85-88 . |
| MLA | 李炎锋 et al. "地方院校新工科建设思路的探索与研究——以土木类专业为例" . | 教育教学论坛 PageCount-页数: 4 . 08 (2022) : 85-88 . |
| APA | 李炎锋 , 李俊梅 , 乔雅心 . 地方院校新工科建设思路的探索与研究——以土木类专业为例 . | 教育教学论坛 , 2022 , PageCount-页数: 4 (08) , 85-88 . |
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Abstract ：
In this study, three full-scale experiments and a series of numerical simulations were conducted to investigate the influence of subway platform height and atrium ceiling height of subway stations on smoke control by mechanical exhausting systems. The smoke temperature variation with time, maximum temperature distribution, and smoke stratification were discussed. Results showed that the atrium had capacity to store smoke, especially at the early stage of smoke spread. However, the efficiency of smoke extraction did not increase simply with the rise in platform height and atrium ceiling height, and favorable smoke exhaust velocity was crucial for smoke elimination. The optimal smoke exhaust velocity was studied by numerical simulation and it was found that the area of smoke diffusion in subway stations with a higher platform was significantly smaller under the optimal smoke exhaust velocity. In addition, a prediction model of optimal smoke exhaust velocity with subway platform height was proposed. This study could provide on-site data and smoke spread characteristics for smoke control design, operation, and, significantly, guide safety evacuation of the exhaust system of subway stations.
Keyword ：
smoke control smoke control simulation simulation full-scale full-scale fire experiment fire experiment
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| GB/T 7714 | Xu, Desheng , Li, Yanfeng , Li, Junmei et al. Investigation on the Effect of Platform Height on Smoke Characteristics of Fire Scenarios for Subway Stations [J]. | SUSTAINABILITY , 2021 , 13 (19) . |
| MLA | Xu, Desheng et al. "Investigation on the Effect of Platform Height on Smoke Characteristics of Fire Scenarios for Subway Stations" . | SUSTAINABILITY 13 . 19 (2021) . |
| APA | Xu, Desheng , Li, Yanfeng , Li, Junmei , Zhang, Jin , Li, Jiaxin . Investigation on the Effect of Platform Height on Smoke Characteristics of Fire Scenarios for Subway Stations . | SUSTAINABILITY , 2021 , 13 (19) . |
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Abstract ：
In this study, a series of small-scale experiments were conducted to investigate the backdraft phenomenon in a compartment (1.1 x 0.4 x 0.75 m) with woodblocks as fuel. This research focused on the effects of compartment window woodblock areas on backdraft time, with a video recording of the experimental phenomena. Thermocouples and a gas analyzer were used to measure the temperature and the concentration of gas components in the compartment, respectively. There was no additional heat source or ignition source pre-set in the compartment at the beginning of the experiments; the experimental processes only depended on the heat released from the burning or smoldering of woodblocks. When compartment ventilation improved, smoldering of woodblocks became intense, and backdraft occurred. The results show that backdraft time is shorten with increases of compartment window and woodblock areas, and opening the upper window of a compartment could avoid the backdraft phenomenon. The results help to understand the backdraft phenomenon of solid fuel and, more importantly, could help firefighters adopt reasonable fire-fighting strategies for restraining backdraft occurrence.
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| GB/T 7714 | Zhao, Jianlong , Li, Yanfeng , Li, Junmei et al. Experimental study on the backdraft phenomenon of solid fuel [J]. | PLOS ONE , 2021 , 16 (8) . |
| MLA | Zhao, Jianlong et al. "Experimental study on the backdraft phenomenon of solid fuel" . | PLOS ONE 16 . 8 (2021) . |
| APA | Zhao, Jianlong , Li, Yanfeng , Li, Junmei , Huang, Youbo , Wu, Jinxiang . Experimental study on the backdraft phenomenon of solid fuel . | PLOS ONE , 2021 , 16 (8) . |
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Abstract ：
区间坡度对停驶地铁列车火灾烟气自然扩散的影响
Keyword ：
区间隧道 区间隧道 坡度 坡度 多尺度模拟 多尺度模拟 地铁 地铁 烟气扩散 烟气扩散
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| GB/T 7714 | 刘慧强 , 李炎锋 , 李云飞 et al. 区间坡度对停驶地铁列车火灾烟气自然扩散的影响 [J]. | 刘慧强 , 2021 , 40 (2) : 188-193 . |
| MLA | 刘慧强 et al. "区间坡度对停驶地铁列车火灾烟气自然扩散的影响" . | 刘慧强 40 . 2 (2021) : 188-193 . |
| APA | 刘慧强 , 李炎锋 , 李云飞 , 樊宪来 , 赵守冲 , 消防科学与技术 . 区间坡度对停驶地铁列车火灾烟气自然扩散的影响 . | 刘慧强 , 2021 , 40 (2) , 188-193 . |
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Abstract ：
The smoke propagation in branched tunnel is more complicated because of the special bifurcation structure that has not been clarified, despite the fact that the scenario exists in practice. In this paper, the thermal smoke movement behavior in branched tunnel fire were experimentally investigated under the combined effect of bifurcation angle and ventilation velocity. The theoretical analysis was conducted to develop the smoke backlayering length equation based on the applied force of smoke propagation upstream of the fire source, and the smoke back-layering length under various longitudinal ventilation velocities was quantified. The results indicate that the smoke back-layering length decreases with the increasing of longitudinal ventilation velocity for a given heat release rate. The stronger heat release rate results in the longer smoke backflow distance under same ventilation velocity. The smoke back-layering length varied with bifurcation angle due to the bifurcation structure weakens the inertial force of longitudinal ventilation, but the affected degree varies with bifurcation angle. The experimental smoke back-layering length can be well correlated using the deduced logarithmic function. The empirical model taking the bifurcation angle into consideration is proposed to predict the smoke back-layering length in branched tunnel fire. Finally, the correlation for critical ventilation velocity of branched tunnel fire under varied bifurcation angles was also proposed based on the boundary condition of none smoke back-layering.
Keyword ：
Smoke movement Smoke movement Branched tunnel fire Branched tunnel fire Back-layering length Back-layering length Longitudinal ventilation Longitudinal ventilation Bifurcation angle Bifurcation angle
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| GB/T 7714 | Huang, Youbo , Li, Yanfeng , Li, Jiaxin et al. Experimental investigation of the thermal back-layering length in a branched tunnel fire under longitudinal ventilation [J]. | INTERNATIONAL JOURNAL OF THERMAL SCIENCES , 2021 , 173 . |
| MLA | Huang, Youbo et al. "Experimental investigation of the thermal back-layering length in a branched tunnel fire under longitudinal ventilation" . | INTERNATIONAL JOURNAL OF THERMAL SCIENCES 173 (2021) . |
| APA | Huang, Youbo , Li, Yanfeng , Li, Jiaxin , Wu, Ke , Li, Haihang , Zhu, Kai et al. Experimental investigation of the thermal back-layering length in a branched tunnel fire under longitudinal ventilation . | INTERNATIONAL JOURNAL OF THERMAL SCIENCES , 2021 , 173 . |
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